Ferguson's cubic

This curve was established in year 1964 J.C. Ferguson.
It is determined by two operative dots V1 and V2 and values of vectors
in these dots v1 and v2. Curve starts in dot V1 and ends in dot V2. The
form of curve is determined by direction and size of vectors v1 and
v2. If both vectors are zero, then resultant curve will be line.
Ferguson's cubic can be written as